public void proxyUploadFile() throws IOException {
    CloseableHttpClient httpclient = HttpClients.createDefault();
    try {
        HttpHost target = new HttpHost("192.168.71.128", 8080); //目的伺服器地址
HttpHost proxy = new HttpHost("172.16.44.22", 9901, "http"); //代理伺服器地址
RequestConfig config = RequestConfig.custom
 
().setProxy(proxy).build();
        HttpPost request = new HttpPost("/upload/file/"); //目的伺服器上傳檔案介面
request.setConfig(config);
        //add file
File file = new File("/home/mydoc.docx");
        HttpEntity data = MultipartEntityBuilder.create().setMode(HttpMultipartMode.BROWSER_COMPATIBLE).addPart("file", new 
 
FileBody(file)).build();
        request.setEntity(data);
        getLogger().info("Executing request " + request.getRequestLine() + " to " + target + " via " + proxy);
        CloseableHttpResponse response = httpclient.execute(target, request);
        try {
            getLogger().info("----------------------------------------"
 
);
            getLogger().info(response.getStatusLine());
            getLogger().info(EntityUtils.toString(response.getEntity())); //呼叫上傳檔案介面返回結果
} finally {
            IOUtils.closeQuietly(response);
        }
    } finally {
        IOUtils.closeQuietly(httpclient);
    }
    return;
}